6.8
Medium
CVE-2026-116684 The Model Context Protocol Python SDK is the official Python SDK for Model Context Protocol servers and clients
Description
The Model Context Protocol Python SDK is the official Python SDK for Model Context Protocol servers and clients. From 1.10.0 until 1.30.0 and 2.2.0, server-side bearer authentication configured through AuthSettings with token_verifier accepts a valid token issued for another service when the authorization server serves multiple resources and the TokenVerifier does not independently validate the aud audience. This resource-confusion flaw lets a token holder authenticate to the wrong MCP server and exercise that token's resulting access. This issue is fixed in versions 1.30.0 and 2.2.0.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| python-sdk 2.0 | 2.0.0 → < 2.2.0 | 2.2.0 |
| python-sdk 1.10 | 1.10.0 → < 1.30.0 | 1.30.0 |
References
- github.com github.com
- github.com github.com
- github.com github.com
- github.com github.com
- github.com github.com
- github.com github.com
- github.com github.com
Timeline
- Published
- Last modified
Other CVEs of python-sdk
The 11 CVEs of python-sdk →
CVE-2026-116686
The Model Context Protocol Python SDK is the official Python SDK for Model Context Protocol servers and clients
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CVE-2026-116685
The Model Context Protocol Python SDK is the official Python SDK for Model Context Protocol servers and clients
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CVE-2026-109527
The Model Context Protocol Python SDK is the official Python SDK for Model Context Protocol servers and clients
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CVE-2026-59951
The MCP Python SDK, called mcp on PyPI, is a Python implementation of the Model Context Protocol (MCP)
6.9
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